Coke oven



April 26, 1932.

K. HUFFELMANN COKE OVEN' Filed Sept. 28. 1926 Lala-5,186

Patented Apr. 26, 1932 UNITED STATES KARL HUFFELMANN, OF MUHLHEIM-RUHR-HEISSEN, GERMANY; MARIANNE HUFFEL- MANN, ADMINISTRATIE-IX 0F SAID HUGO SCHRDER, 0F ESSEN, GERMANY KARL HUFFELMANN, vDECEASlll),l ASSIG'rNOR,y T0

COKE o'vEN Application :nea september 2s, 1926, serial No. 138,149,v and ijn Germany April 28,1926. ,c

My invention relates to improvements in coke ovens, and more particularly to the construction of the fines.

In coke ovens now in use with vertical flues having a burner at their lower ends, the upper part of the oven is apt to be heated less than the lower part; so that the operation of coking is finished in the bottom sooner than at the top. A condition like this constitutes a serious disadvantage, and numerous efforts aiming at improvement have been made.

According to this invention, a more uniform and equal heating of the top and bottom portions of a coke oven is secured by, providing in the upper parts of the fiues whichpass through the walls of the chambers, suitable projections which reduce the cross-section' of the fiues or passages and increase the indirect heat transmission by radiation. Due to the reduction of the cross-section of the passages, an increased rate of flow through the iues or passages takes place and thus the heat transmission is increased. The indirect hea-t transmission is materially greater, because the projections in the upper part of the flues do not touch the walls of the chamber and are brought to al higher temperature due to the reduced heat transmission. The heat radiation increases with the fourth power of the absolute temperature so that a few degrees of increase of temperature means a great difference in the result. The size of the proj ections increases gradually towards the top and the heat transmission in the upper part of the iiues is equal to that in the lower part; even though in the lower part the direct heat transmission is greater than in the upper part because of the higher temperature of the gases of combustion and of the flame of the burners.

To compensate the coking in the various sections of the oven, a newly discharged chamber and a newly filled adjacent chamber can be worked together. In this field two adjacent sections of a coking oven should not be discharged or emptied at the same time, or one short-ly after the other. Instead, the 0pe-rator always empties a. chamber and fills it up again alongside a chamber where Colrmg is proceeding and has nearly been com-v pleted. rlfhese adjacent chambers or sections have a strong heating action o-neach other because lhea.t"is.radiated from the heated chamber to the Vcold chamber. According to this invention, such radiation between a hot A.

chamber and a cold chamber is avoided in the upper part of the wall by means of the projections in the flues or passages within said Y wall, Vsuch projections acting like screens .so

that only the lower part of a hot' chamber canV c give up apart of its heat :toa newly filled chamber by radiation,` l

For the purpose of explaining the inven`- tion an example embodying thefsame has been shown in the accompanyingdrawings, y,

in which the sam-e letters oflreferencehave` been used in all the views to indicate corre-Y l sponding parts." In said drawings,

Fig. l isa fragmentary'longitudinal vertical section through the upper part of a coke oven embodying vertical flues in accordance with the presentv invention;

Fig; 2 is a'fragmentary vertical cross section through a coking chamber and heating walls, and as well through the regenerator in the lower part of the coke oven.

Fig, 3 represents a horizontal cross section through a coking chamber and the adjacent heating walls; and

Figl is a fragmentary cross sectional view showing a modification in the construction of the heating wall. i

In the examples shown in the .drawings the coke oven comprises horizontal -cokingV chambers 7c separated from each other by heating walls having vertical flues a, the burners b being provided atthe bottom parts ofthe Said flues. Attheir bottom Vparts the fiues are separated by plane transverse walls c, while at the top parts thetransverse walls are composed of bricks CZ formed 'with lateral projections e or f, the form of the said projections being such that the heating surfaces g of the longitudinal heating walls 7L and z" are not reduced in area. By thus reducing the cross-sectional area of the flues, the v'elocity of the gases is increased, which resultsl in an increased indirect transmission of heat by radiation, andfinally in a reduction of the radiation from one side wall of the flu-e to the other. VThe heat transmitted from thev heating gases to the projecting portions e yand f can not be directly transmitted to the coking chambers. Thereby the temperature ofthe said projecting portions is increased as compared to the temperature of the side walls of the flues, so that they transmit heat projecting portions 'are disposed so that they donot intersect the direction of the burners. By the said combined actions of the projecting portion-s e and f the transmission of heat is increasedin the top parts of the flues, so

lthat the difference of the heating effect of the gases on the top and bottom parts of the coking chambers is compensated.

.In coke ovens having narrow coking chambers the liues are comparatively broad, because regenerators of a certain size must be disposed below the ovens, and the height ofthe said regenerators can not be increased at will' in view of the strength of the structure. In ovens of this type my improved structure of the flues is particularly important. l While in describing the invention reference hasb'een made to particular examples embodying the same I wish it to be understood that my invention is not limited to the constructions shown in the drawings or to the use thereof in ovens of the class referred to. Further, I wish it to be understood that my improved construction of the heating walls may be-generally used in ovens provided with heating chambers, and that the invention is not limited to the use of the said heating walls in coking ovens. The projections are directly opposite each other excepting when projections of the form shown at f 'are employed they are not placed vopposite each other but one is near the one wall h. and the other nearer to the opposite wall h. These projections Vf are'shown as having the form of ribs presenting one facev squarely to the adjacent wall, the other face being inclined.

I claim:

l. A coke ovenheating wall construction including vertical opposing side-walls and vertical opposing transverse walls connecting the side walls and forming vertical lues for the flow upwardly of heating gases, longitudinal projections on the transverse walls along the upper reaches of the flues, reducing the cross sectional area of the upper reach of each of the flues so that the cross-sectional area of the upper reach of the flue isy materially less than that of the lower reachof the flue, the positions of said projections being such with relation to the side walls that the heating surfaces Iof lthe latter remain undiminished in extent to the upward iow of heating gases through the upper narrowed reaches of the flues. Y

for the flow upwardly of heating gases, longitudinal projections on the transverse walls along the upper' reaches of the'flues, extending into the flues and reducing the cross Vsectional area of each of said tlues,.said projections being located between the side walls and leaving the heating surfaces of the side walls fully exposed tol the vvupward flow of gases through the reduced upper Vreaches deined by the side walls, transversewalls and projections. Y,

3. A coke oven heatingwall construction including confronting sidewalls and confronting transverse walls connecting the side walls and forming a vertical flue, longitudinal projections on the confronting faces of the transverse walls along the upper reach of the -tlue, said projections extending toward each other and into the flue and being spaced from both of said side walls and reducing the cross sectional area of the upper reach of the flue so lthat the cross-sectional area. of the upper reach of the flue is y'materially less than that of the lower reach of the lue.Y A Inv testimony whereofI hereunto ai'x my signature. I v l kKARL HUFFELMANN. 

